Magnetic ore-separator.



APPLICATION FILED OCTHQX 1914,

,L g 5 R H N f1 an E L v. S

ing pole that had passed. The ore particles which have .been attracted to the drum will cling together in little strings, each string yactingv as a magnet vfith a north and a south pole.

vIn order to make clear the action of the separator, I shall assume that the current is on the magnets, but that they as well as the drum are standing still. strings of ore will all be arranged in lines across the face of the drum, conforming to the flux of the magnets. Oncertain lines parallel to theaxle of the drum, the strings Will be standing right out from the face, in others they will lie flat on the drum, and in between these two extremes they will be arranged at giadually changing angles. Assume now that the magnets inside the drum are being' rotated, but that thedrum itself is kept in the same position. The combined fields of the magnets and the residual magnetism in the drum cause the strings of ore to turn end for end, and to move along the periphery of the drum in opposite direction to the movement of the magnets. If the drumnow also is revolved in the opposite direction to the magnets, the movement of Athe ore along the peri hery will be accelerated. As the ore particles will move faster than the drum, they wll be distributed in thinner layers than W uld be the case if they moved at the same speed as the drum or at a lower speed. This will explain why this separater has a.larger capacity than other types in which the ore moves no faster than the drum, and in many cases keeps slipping on its face so that it actually gets hunched together and moves much slower than the drum.

help the cleaning of the ore a number of-r Water s rays from perforated pipes Gare directe toward the face. of the drum, and

continually wash the ore 'and relieve it`l of any non-magnetic slimes and other im- The little From this description it is evident that theV separator will Work even purities that may adhere to. theoregrains.

. This washing goes on while the ore is carrled from the box underneath the drum untilit is delivered at the oil-taker ELWhere the A ore particles jump across to the iron pegs owing to induced magnetism therein andare delivered to a launder as a finished product 'or to Abe retreated in another machine.

The vessel under the separator neednotheof the particular construction shown,'. but preferablyl conforms to its general type. Similarly the drum construction -may be varied 'so long as it maintains its essental characteristic as a magnetic drum, since the apparatus will not separate properly with a non-magnetic drum.

' I claim as myinvention 1. In a magnetic separator, a plurality of magnets of alternating polarity mounted on l a suitable axis, a rotary. magneticdrum ar -rangedaround said magnets and in close proximity to their poles, and means for rotating the magnets and drum simultaneously in opposite directions. I

2. In a magnetic separator, a plurality of 'magnets of alternating polarity mounted on a suitable axis, a rotary/ magnetic drum arranged around said magnets and in close proximity to their poles, and means' for rotating the magnets andfdrum simultaneously in opposite directions, in combination with means for washing the ore while it is .tum-y bling o'ver the face of the drum.

3. Ina magnetic separator, a plurality of magnets of alternating polarity mounted on a suitable axis, a rot/ary magnetic drum arranged around saidv magnets and in close proximity to their poles, and means for rotating the magnets and drum simultaneousl in opposite directions, in combination wit r a magnetic olf-taker arranged at least 180 distant in the direction ofthe rotation of the drum from the pointat which the ore is l i fed to lthe drum', together with means for constantly Washing the ore while it is tum- 'bling over the face of thedrum to the offtaker. Y In testimony whereof I have signed 'my name to this specification, in the presence of two subscribing Witnesses.

. SVEN'RAGNAR SALWEN.

Witnesses:

' C. BRO'DN,

finirla Piura. 

